硅烷偶联剂对石英砂滤料的表面改性

采用硅烷偶联剂KH-550对石英砂滤料进行表面改性,以提高滤料表面的亲油疏水性.通过正交―单因素实验,考察KH-550浓度、改性温度以及搅拌时间对石英砂滤料表面改性效果的影响.结果表明,KH-550浓度为15%、改性温度为110℃、搅拌时间为15min时改性效果最好,水的润湿重量由改性前的1.5589g减小到0.0607g,而油的润湿重量改性前后基本不变.改性后石英砂对油的吸附容量增大到0.1843,与未改性石英砂相比提高了27.72%.扫描电镜与电子能谱研究表明,KH-550以化学键的方式结合在石英砂滤料表面,形成了牢固的有机包覆层,使得石英砂滤料的亲油疏水性大大提高.

Silane coupling agent for surface modification of quartz sand filter medium

The quartz sand was surface modified using silane coupling reagent KH-550 to improve the hydrophobicity of filter medium as well as increase the oily wastewater treatment performance. The effect of the concentration of the silane coupling agent KH-550, modified temperature and stirring time on modification were studied by orthogonal and single-factor approach. Results show that when the KH-550 concentration was 15%, reaction temperature was 110℃ and stirring time was 15min, quartz sand modification had the best effect. Wetting weight of water could be reduced from 1.5589g to 0.0607g by surface modification while oil wetting weight were almost unchanged before and after modification. The adsorption capacity of modified quartz sand was greatly improved to 0.1843 for oil, and was 27.72% higher than unmodified quartz sand. XPS and SEM shown that KH-550 combined in the surface of the quartz sand with chemical bonds, form a solid organic coated layer.